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Now let s take a look at how redo and undo work together in various scenarios. We will discuss, for example, what happens during the processing of an INSERT with regard to redo and undo generation, and how Oracle uses this information in the event of failures at various points in time. An interesting point to note is that undo information, stored in undo tablespaces or undo segments, is protected by redo as well. In other words, undo data is treated just like table data or index data changes to undo generate some redo, which is logged. Why this is so will become clear in a moment when we discuss what happens when a system crashes. Undo data is added to the undo segment and is cached in the buffer cache, just like any other piece of data would be.

Table 3.10 Examples of argument pointcuts Pointcut args(String,.., int) args(RemoteException) Natural Language Description All the join points in all methods where the first argument is of type String and the last argument is of type int. All the join points with a single argument of type RemoteException. It would match a method taking a single RemoteException argument, a field write access setting a value of type RemoteException, or an exception handler of type RemoteException.

ops$tkyte@ORA10G> update t set indexed = lower(indexed); 48771 rows updated. ops$tkyte@ORA10G> select used_ublk ... 10 / USED_UBLK ---------1938 As you can see, updating that indexed column in this example generated almost five times the undo. This is due to the inherit complexity of the index structure itself and the fact that we updated every single row in the table moving every single index key value in this structure.

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As an example, we will investigate what might happen with a set of statements like this: insert into t (x,y) values (1,1); update t set x = x+1 where x = 1; delete from t where x = 2; We will follow this transaction down different paths and discover the answers to the following questions: What happens if the system fails at various points in the processing of these statements What happens if we ROLLBACK at any point What happens if we succeed and COMMIT

Conditional check pointcuts This pointcut captures join points based on some conditional check at the join point. It takes the form of if(BooleanExpression). Table 3.11 shows some examples of the usage of conditional check pointcuts.

The initial INSERT INTO T statement will generate both redo and undo. The undo generated will be enough information to make the INSERT go away. The redo generated by the INSERT INTO T will be enough information to make the INSERT happen again. After the INSERT has occurred, we have the scenario illustrated in Figure 9-1.

In the last chapter, we briefly investigated the ORA-01555 error and looked at one cause of it: committing too frequently. Here we are going to take a much more detailed look at the causes and solutions for the ORA-01555 error. ORA-01555 is one of those errors that confound people. It is the foundation for many myths, inaccuracies, and suppositions.

Figure 9-1. State of the system after an INSERT There are some cached, modified undo blocks, index blocks, and table data blocks. Each of these blocks is protected by entries in the redo log buffer.

ORA-01555 is not related to data corruption or data loss at all. It is a safe error in that regard; the only outcome is that the query that received this error is unable to continue processing.

Table 3.11 Examples of conditional check pointcuts Pointcut if(System.currentTimeMillis() > triggerTime) if(circle.getRadius() < 5) Natural Language Description All the join points occurring after the current time has crossed the triggerTime value. All the join points where the circle s radius is smaller than 5. The circle object must be a context collected by the other parts of the pointcut. See section 3.2.6 for details about the context-collection mechanism.

Everything is OK. The SGA is wiped out, but we don t need anything that was in the SGA. It will be as if this transaction never happened when we restart. None of the blocks with changes got flushed to disk, and none of the redo got flushed to disk. We have no need of any of this undo or redo to recover from an instance failure.

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